The birds sang.

Birds sing.

Birds fly.

In North America, most of the species in this family are known as (American) sparrows, but these birds are not closely related to the (Old World) sparrows, in the family Passeridae.

There were a lot of birds in the tree.

I'm going to leave you with a little bit more birdsong.

where the birds make their nests. The stork makes its home in the fir trees.

Where the birds make their nests as for the stork, the fir trees are her house.

And I have a tip for you. If you have to work in spaces like that, carry headphones with you, with a soothing sound like birdsong.

Humpbacks, when they develop the ability to sing this song, they're listening to other whales and modifying what they sing based on what they're hearing, just like song birds or the dolphin whistles I described.